Amplifier



Sept. 18, 1923. 1,468,437

A. BENOIT ET AL AMPLIFIER Filed April 22 1921 nimh 'www Fie-.3. Z

'- ners or abrupt angles.

Patented Sept. 18, l92 3.

UNITED STATES PATENT OFFICE.

ANTONIO BENOIT, JOSEPH LUCIEN MATHIEU, AND HENRI HORMISDAS DUCHESNE,

0F MONTREAL, QUEBEC, CANADA, ASSIGNORS TO BENOIT & MATHIEU, 0F MON-TREAL, CANADA.

AMPLIFIER.

Application led April 22, 1921. Serial No. 463,715.

T o all whom, t may concern.'

Be it known that We, ANTONIO BENOIT, British subject, JOSEPH LUOIENMATniEU, British subject, and 'HENRI HORMTSDAS DU- OHESNE, citizen ofthe United States of America, residin at #1.95 St. Timoth Street, in thecity of Montreal, in the Province of Quebec, in the Dominion of Canada,have invented certain new and useful Improvements in Amplifiers; and wedo hereby declare that the following is a full, clear, and exactdescription of the same.

The present invention relates to improvements in amplifiers; and itconsists in providing'an amplifier having a continuous and graduatedtaper beginning at the base of the tone arm and terminatin at the mouth,the opening of said ampli er being preferably similar in shape to thebase, and gradually enlarging in the shape of an oval.

By reason of this gradual taper, the vibrations or sound waves will flowsmoothly, and will be gradually amplifiedby raduated and even sides,thus eliminating s arp cor- The invention will be better understood withthe aid of the following description and accompanying drawing, in which:

Figure 1 is a side vertical sectional view of the amplifier adapted to atalking machine.

Figure 2 is a cross section on line 2-2 of Figure 1.

Figure 3 is a cross section on line 3-3 r of Figure l.`

Referring to the drawing: i

1 is a talking machine casing or cabinet, and 2 is the usual hingedcover. A partition?) is provided in the upper portion of the cabinet onwhich are mounted the tone arm 4 and the turn table 5, the formerbearing the reproducer, and 6 is the usual motor which is secured belowsaid partition 3 and which actuates the turn table.

Below said partition 3 is provided the amplifer 7, one end of whichprojects through the opening 8 in said partltion 3, and fits snugly intothe bearing 9 of the tone arm 4.

A ange 10 is provided on said amplifiery which rests against the'underside of said partition 3 and by means of which the amplifier may berigidly secured. The amplifier is preferably curved so as to avoidcontact with the motor 6.

The amplifier at its meeting end with the tone arm has approximately thesame internal diameter as the tone arm outlet, and then gradually tapersin vertical section to its mouth. The taper in horizontal section ismore pronounced than the vertical taper, and gradually extendshorizontally at a more pronounced angle, thus causing the amplifier totake an oval shape which gradually flattens as it nears its mouth.

What we claim as our invention is A sound amplifier for talking machineshaving a cross-section from end to end in the form of a closed curve andcomprising a throat, and a bell extending substantially horizontallyforward and at an angle therefrom; said throat being gradually taperedboth horizontally and vertically from a point adjacent its free end,where it is of circular section, to the point 'where it merges into thebell, the horizontal taper gradually assuming a more pronounced anglethan the vertical taper between said free end and said merging point sothat an elliptical section is thereby produced having a horizontal majoraxis of gradually increasing length; said bell having a continuousgradual taper from said merging point to its free end or mouth bothhorizonta ly and vertically, the horizontal taper being relatively morepronounced as compared with the vertical taper than the horizontal taperin the throat portion.

Signed at Montreal, Quebec, Canada this 26th day of March 1921.

ANTONIO BENOIT. JOSEPH LUOIEN MATHIEU. HENRI HORMISKDAS DUOHESNE.

Witnesses:

C. PATENAUDE, A, P, DEAL.

